706_S2006_Exam4 - Name 7.06 Cell Biology EXAM#4 This is an...

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Name: _________________________________ 1 7.06 Cell Biology EXAM #4 May 23, 2006 This is an OPEN BOOK exam, and you are allowed access to books, a calculator, and notes BUT NOT computers or any other types of electronic devices. Please write your answers in PEN (not pencil) to the questions in the space allotted. Please write only on the FRONT SIDE of each sheet, as we will Xerox all of the exams and thus only grade writing on the front. And be sure to put your NAME ON EACH PAGE in case they become separated! There are SEVEN pages including this cover sheet. Question 1. 21 pts __________ Question 2. 22 pts __________ Question 3. 20 pts __________ Question 4. 20 pts __________ Question 5. 17 pts __________ TOTAL 100 pts __________
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Name: _________________________________ 2 Question 1. (21 pts) Answer the following questions about actin and microfilaments. (a, 3 pts) What happens (net growth, net shrinkage, or no net change) to filament length when microfilaments are incubated at each of the following concentrations of monomer? …a monomer concentration equal to the Cc for the (–) end? …a monomer concentration equal to the Cc for the (+) end? …a monomer concentration equal to the Cc for the filament? (b, 6 pts) What happens (net growth, net shrinkage, or no net change) at each end when microfilaments are incubated at each of the following concentrations of monomer? …a monomer concentration equal to the Cc for the (–) end? …a monomer concentration equal to the Cc for the (+) end? …a monomer concentration equal to the Cc for the filament? (c, 4 pts) Cytochalasin D and latrunculin both lead to the destabilization of microfilaments. However cytochalasin D binds to F-actin and latrunculin binds to G- actin. Explain how this difference in mechanism can still lead to the same effect.
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This note was uploaded on 01/23/2012 for the course BIOLOGY lsm1301 taught by Professor Seow during the Spring '11 term at National University of Singapore.

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706_S2006_Exam4 - Name 7.06 Cell Biology EXAM#4 This is an...

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